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Патент USA US3049142

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Aug- 14, 1962
3,049,132 ‘
Filed April 4, 1958
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United States Patent G?tice
Patented Aug. 14, 1962
Charles Colston Limited, a corporation of the United
powered by an electric motor comprises a control element
for actuating a start and stop switch in the motor circuit
and a manual control means for moving the control ele—
ment to close the switch and start a washing cycle.
Filed Apr. 4, 1958, Ser. No. 726,394
Claims priority, application Great Britain Apr. 5, 1957
13 Claims. (Cl. 134—57)
or disengaging the power drive to the control elements in
the event of there being an insu?‘icient quantity of wash
ing liquid present in the system and of restarting or re
Robert John Giison, New Malden, England, assignor to
Means may also ‘be provided for temporarily stopping
engaging the drive as soon as the correct amount of liquid
This invention relates to dish and like washing ma 10 is present.
chines intended primarily for domestic purposes.
Conveniently the start and stop switch is utilized to
It is customary in a dishwashing machine which oper
open the electric motor circuit and thus arrest the power
ates in accordance with a timed sequence of operations,
for the ?lling of the machine, with either washing or
According to another feature of the invention an elec
rinsing water, to be under the control of a solenoid
tric heater is provided for heating the liquid in the
operated valve. This solenoid-operated valve is arranged
washing chamber the heater being so arranged that it
to be open for such a time that, with reasonably constant
only comes into operation when the correct amount of
rate of water supply, the machine ?lls with the desired
liquid is present in the ‘system.
amount of water which e?ectively performs the washing
or rinsing operation.
However, since the pressure of the water supply may at
times be low, or since the valves may become partially
choked, the machine may not become ?lled with the
necessary amount of water during the time the valve is
open. Consequently, the washing and rinsing operations
may not be performed as efficiently as is desired.
The main object of the present invention is to provide
a washing machine ‘which when started up, is capable of
performing a predetermined washing cycle and which
will automatically stop itself should there be insu?icient
water in the system and re-start only when su?icient
water has entered and which will also ensure that ‘washing
and/or rinsing times are adequate despite any intermp
The invention is illustrated in the accompanying draw
ings in which:
FiGURE 1 is an elevation of a dish-washing machine
in accordance with one embodiment of the invention;
IGURE 2 is a sectional view on the lines 2--2 of
FIGURE 1 and FIGURE 3 a sectional plan view;
FIGURE 4 is a sectional elevation and
FIGURE 5 is a plan view respectively of the cam
control mechanism as shown in FIGURE 4;
FIGURE 6 being a fragmentary sectional view on
the lines 6-6 of FIGURE 4;
FIGURES 7, 8 and 9 are part views in elevation of
the several control cams;
FIGURE 8A is a detail view of a motor switch and
control cam;
FIGURE 10 is a sectional elevation on an enlarged
tion in the supply of water to the machine.
Another object of the invention is to provide a ma
scale of the inlet valve;
chine which can be used in conjunction either with a
FIGURES ll, 12 and 13 show a modi?ed arrangement
cold or hot water supply by incorporating an electric
of the control system;
heater for heating the water to a suitable temperature.
FIGURE 11 being a detail section of the sump to the
Another object of the invention is to provide means
washing chamber;
for varying the overall time of the washing cycle so that 40
FIGURE 12 a section of the actuating mechanism in
the user can readily adjust the machine to give a normal
cluding an actuator lever and pressure responsive mem
or long wash.
her by which it is operated;
A further object of the invention is the provision of an
FIGURE 13 is a detail elevation showing a modi?ed
inlet valve designed to require small actuating forces and
movements over the wide range of supply pressures.
Still another object of the invention is the provision
of means for introducing an additive compound, e.g. a
_ form of water inlet control valve; and
FIGURE 14 is a detail sectional elevation showing
one form of additive dispenser.
FIGURES l5 and 16 are respectively a diagrammatic
sectional elevation and side view of a modi?ed arrange
According to the present invention, a ‘washing ma
ment of the control system. ‘FIGURE 15A is a detail
chine comprises a washing chamber, an inlet to said 50 view of a motor switch biasing lever. FIGURE 17 is a
detergent to the washing liquid.
chamber for connection with a washing liquid supply
and provided with an inlet valve to control admission
of liquid to said chamber, a liquid discharge outlet, a
valve for controlling the discharge of liquid through said
outlet, a spraying device within the washing chamber,
power operated means to operate the spraying device and
means which becomes operative on starting up the power
operated means to open the inlet valve to admit liquid to
the chamber and means responsive to pressure set up by
detail view showing the interlocking mechanism between
the motor switch and the cabinet door and‘ FIGURE 18
is a diagrammatic sectional elevation of one form of
valve suitable for use as the dispenser operating valve.
In the drawings there is shown a washing chamber C
having an impeller I to which the washing liquid, herein
after referred to as water, is supplied through a manifold
M by means of a pump P, the pump P drawing from a
sump S in the bottom of the chamber C. The construc
the head of liquid in the washing chamber for closing 60 tion and operation of the impeller I and water circula
or permitting closing of said inlet valve when a prede
tion system is the subject of the co-pending application
termined amount of washing liquid is present in said
Alfred Henry Wickham and Robert John Gilson,
Serial No. 810,883, ?led May 4, 1959 as a continuation
A further feature of the invention comprises the pro
in-part of their application Serial No. 629,124, ?led De
vision of a power unit which is set into operation on
cember 18, 1956. Drive to the impeller I is from suitable
commencement of a washing cycle and a control means
including control elements operatively connected to the
power unit or to a part driven therefrom, and connec
tions between said elements and the inlet and outlet valves
respectively whereby the latter are automatically ‘ac
tuated to conform to a predetermined washing cycle.
Another feature of the invention where the machine is
power operated means, as shown an electric motor E and
may be by belt and pulley as shown, the motor E also
providing the motive force for a control cam unit, indi
cated generally at A, ‘by which the ?lling and draining of
the washing chamber with water is performed in timed
Water is fed to the washing chamber C from a pipe 1
which is coupled to a water main or other source of
supply and thence through an inlet control valve 2 from
which a pipe 3 opens into the interior 4 of the cham
ber C. The outlet or main drain from the chamber C
consists of a pipe 8 connecting with the bottom of the
manifold M, in which is a valve 5, which normally re
mains closed.
A chamber 42, for the purpose hereinafter described,
Within the lower part of the container 301 is a bell
shaped casing 306 which in conjunction with a piston ele
ment 310 provides a pump device for forcing liquid from
the container 301 to the interior of the sump S.
The piston element 310 which may be formed of ?ex
ible material comprises a lower skirt portion 312 by
which it is ?exibly secured to the casing 301 by means
of the end plate 302 of the container so that the piston
as a whole is capable of up and down movement in rela
is attached to the sump, this chamber 42 having an outlet
7, from which leads a pipe 10 to the manifold M to pro 10 tion to the casing 306, the latter having a spigotted end
308 by which it is connected through a central pipe 307
vide means whereby the chamber 42 may be completely
to the neck 303. At its upper end the pipe 307 opens
drained and also to provide a ‘back pressure from the
into a counterbore 304 from which extends a lateral duct
manifold to the chamber when the pump is operating.
309 opening into the interior of the sump S. The piston
The sump S beneath the washing chamber 4 is sepa
rated from the latter by a ?lter 12 (FIGURE 2), the 15 element 310 includes an upper skirt 311 which is a sliding
?t within the casing 306 and within the casing is a coil
water passing from the space 13 beneath the ?lter through
spring 314 by which the piston is urged in a downwards
a pipe 15 which connects to the pump P so that during
direction to the position shown in the drawing.
the washing operation, the water will be continuously
Flow of liquid from the interior of the container 301
circulated from the sump via the interior passage 16 of
the manifold M to the interior of a distribution pipe 17 20 to the interior of pump casing 306 is controlled by a self
closing ball valve 315 which is maintained against its
on which an impeller cylinder indicated at 18 is mounted
seating by a spring 316. Similarly the out-?ow of liquid
to revolve.
from the interior of the casing 306 is by means of a self
Motor Drive
closing second ball valve 317, maintained against its
seating by a spring 318.
Drive to the impeller is by means of a shaft 19 on the 25
It will be seen that the lower skirt 312 of the piston
outer end of which is fastened a pulley 20, the pulley 20
element 310 encloses an interior space 313 into which
being coupled by a belt drive 21 to a pulley 22 fastened
opens a pipe 300, the pipe being connected at its other
on the output shaft of the motor E.
end to the air bottle containing the compressed air sup
On the output shaft of the motor are also small and
ply. A valve 326 in pipe 300 normally remains closed
large size pulleys 23, 24 by which drive is transmitted to
to cut off space 313 from the compressed air supply.
a pulley 25 (see also FIGURE 5) by which the control
The valve 326 is moved to open by a control means com
' cam unit A is operated as hereinafter described.
It will
be obvious that the overall cycle time for the washing,
rinsing and drying periods may be varied by connecting
one or other of the two pulleys ‘23, 24 to pulley 25.
Alternatively any type ofradjustable pulley drive may be
used instead of the two-step pulley 23-24.
prising the actuating lever 36.
It follows, therefore, that when the valve 326 in the
pipe 300 is moved by the actuator lever 36 to its open
position, the increase in pressure in the interior space 313
will force the piston element 312 upwardly so that any
liquid in the pump casing will be forced outwardly past
Drive to the pump P is obtained by carrying the drive
the outlet valve 317 and thence to the sump S.
belt from the motor pulley 22 over the impeller shaft
On the return stroke of the piston element 310, the
pulley 20 to a third pulley 26 fast on the pump shaft.
discharge valve 317 will automatically reseat itself and
To enable the machine to operate as efficiently either
at the same time the inlet valve 315 will open to draw
with a hot or cold water supply and to maintain the
in a fresh supply of liquid from the interior of the con‘
' desired washing temperature irrespective of the size of
itainer 301.
the wash there is provided means for heating the water
Means may be provided for limiting and thus adjust
within the washing chamber or sump. Mounted within
the sump S is an electrical heater unit in the form of a
resistance element 30, the control and operation of which
will hereinafter be described.
To assist in the washing operation a detergent or
wetting agent solution may be added to the washing or
rinsing liquid and for this purpose. there is provided ex
ternally of and beneath the washing chamber C a con
tainer 32, such solution being fed from container 32 to
the interior space 4 of the chamber C through a dis
pensing nozzle 33, by means of a plunger 34 projecting
from the underside of the container which may be de
pressed by hand, but in the preferred embodiment is
mechanically operated by means of one arm 35 of a
two armed lever 36 mounted for rocking movement about
a fulcrum 37.
Alternatively the dispenser control lever 36 may oper
ate a valve in a pipe coupled to a compressed air supply
from an air bottle generated by means of the pressure
in the manifold'M. The compressed air when the valve
is open is used to operate a plunger within the container
32 to force liquid from the container.
Referring now to FIGURE 14, there is shown one
such arrangement together with an alternative construc
tion of additive dispenser. The dispenser which com
prises a container 301 for the additive e.g. a wetting agent
to be dispensed, is supported by the lower wall of the
sump S of the washing chamber, and is formed for this
purpose with a screwed neck 303 which passes through
an opening in the sump wall and is secured to the sump
casing by means of a nut 305.
ing the stroke of the piston element 310 and conveniently
this takes the form of a threaded plug 318 which registers
with a central boss 323 on the inside of the piston.
Mounted on the plug 318 is a ?exible sealing strip 319
so that the interior of the pressure chamber within the
lower skirt, remains sealed irrespective of the movement
of the plug 318. 320 indicates a self-locking nut.
Provision is made for ?tting a transparent plastic gauge
tube 321 to a side wall of the casing 301 to enable the
user readily to estimate the quantity of liquid remaining
within the container.
When the level of liquid becomes too low, the container
301 may be recharged by removing a ?ller cap 325,
access to which is from the interior of the sump S.
‘In operation when the control lever 36 is operated to
open the valve 326 in the pipe 300, air under pressure
passes into the chamber 313 from the air bottle and acts
on the lower side of the piston 310 to force it upwardly
against the action of the spring 314. The discharge
valve 317 is forced from its seating and a regulated
amount of liquid from the dispensing chamber passes up
the pipe 307 to the outlet duct 309 and from there to the
washing chamber. The inlet valve 315 while this opera
tion is taking place, is retained against its seating and
thus remains closed to prevent communication between
the interior of the pump casing 306 and the interior of
the container 301.
The movement of the piston 310 is limited by means of
the self-locking nut 320 which, in the extreme position,’
abuts against the lower side of the end plate 302. A
maximum movement of 3A6” is normally allowable.
When the valve 326 in pipe 300 is closed the coil
spring 314 acts on the top of the piston 310 to return
this to the position shown in FIGURE 14. Downward C1
transmitted to the actuator lever by the plunger 46 when
the required amount of water has entered the sump.
Provision is made to adjust the tension of the spring
62 by means of a threaded adjustment on pin 39 and
thus to determine the depth of water to be contained in
movement of the piston tends to create a suction within
the sump before the weight of water acting on the plunger
the pump casing which closes the ball valve 317 against
46 will move this into a position to disengage the roller
its seating, opens the inlet valve 315 and sucks in a further
57 of the actuator 54) from the notch portion 60 of the
supply of liquid through the opening 322 into the
detent lever 56.
Alternatively, the actuator lever 50 may be magneti
A ?ne mesh gauze ?lter 327 is positioned across the
cally controlled. In one such arrangement the spring
tank above the dispensing chamber.
actuated detent is replaced by a permanently magnetised
element that is attached to the non-pivoted end of the
Control Mechanism
lever 50. This magnetic element co-operates with an
armature positioned on the plunger casing and is so ar
The present invention is primarily concerned with the
ranged that an air gap is present between the armature
valve control mechanism by which the washing unit is
and the magnetic element, when these are in their engaged
charged and emptied of water in timed sequences which
position. The force of magnetic attraction between the
entails intermittent operation of the inlet valve 2 and
magnetic element and its armature may be adjusted by
the outlet valve 5 to open and close and vice versa. It
should be explained that the amount of water within the 20 increase or decrease in the size of the air gap, the ar
rangement normally being such that the force of magnetic
chamber v4, the sump S and in circulation through the
attraction is just sufficient to balance the pressure trans
pump and manifold M connecting the latter to the im
mitted to the actuator lever by the plunger 46 when
peller is not su?icient to ?ll the washing chamber 4 and
the required volume of water has entered the sump S.
in practice does not exceed the capacity of the sump
25 Once this predetermined volume is present the magnetic
and manifold so that the interior space of the washing
element will be pulled against the magnetic force of at
chamber remains unobstructed to enable the spray jets
traction away from the armature when the actuator lever
from the impeller freely to impinge on the plates or
50 is free to move to carry out the operation as de
other articles placed within the chamber 4 for washing.
The present invention provides for controlling the op
scribed above.
eration of the inlet valve 2 by means responsive to the
volume as measured by the head of water within the
sump S. For this purpose there is provided in the base
13' of the sump S, (FIGURE 4) an opening leading
vided with an extension 65, having threaded holes 66
by which it is secured in position by a nut 44. Within
the bell chamber or housing 42 are vertical guides 45 for
a plunger element 46, this plunger element terminating
Control of the inlet valve 2 is by means of a cam 70
(FIGURE 9) termed the inlet cam fastened upon a cam
Opposite the upstanding arm 58 of the actuator lever
50 is a similar upstanding arm 64 which arm is pro
and 67 therein for connection to trip wire connections
into the chamber 41 provided by the bell-shaped housing 35 80—81 hereinafter described.
or chamber ‘42, the latter having a threaded spigot 43
Inlet Valve and Starting Control Cam
in a skirt 47 of a diameter substantially of a size to 40 shaft 69 under the control of a manually operable start
enclose the bottom of the housing ‘42, the annular space
between the perimeter of the skirt and the rim of the bell
housing being enclosed by a ?exible diaphragm 48 which
is held in position by means of a circlip 49 entered in
an exterior groove in the housing
It will thus be seen, that the Water within the sump
and the Washing chamber 4 has direct access to the
interior of the bell chamber 42, so that the pressure due
to this head of liquid which in practice will not exceed
the depth of the sump S will act directly on the plunger
element 46 and cause it to be displaced in its guides 45.
The displacement of the plunger is transmitted to an
actuator lever 50, this lever being mounted for pivotal
movement about a pivot pin 51 carried by lugs 52
(FIGURES 4 and 5) on the exterior of the bell housing
42. Diametrically opposite the lugs 52 is a second pair
of lugs 53 having a pivot 55 for a detent lever 56, which
lever 56 co-operates with the actuator lever 50 by means
ing knob 68. Knob 68 enables the operator manually
to rotate the cam shaft to set the cam mechanism, here
inafter described, into motion to control the operating
cycle of the washing machine, a slipping clutch being in
troduced into the drive to allow this manual rotation.
' Rotation of cam 70 is in a counterclockwise direction
as shown in FIGURES 4, 7, 8 and 9 or, if 'viewed from
a point in front of the control knob 68 (FIGURE 5)
in clockwise direction. Also fastened on the cam shaft
69 is a motor control switch cam 119 (see also FIG.
8), hereinafter termed the switch cam, this cam control
ling a plunger 112 which on depression by the cam
110 operates an electric switch 111 by which the motor
circuit is opened and closed to stop and start the mo
The electric switch 111 is mounted on a bracket
" plate 114 pivotally attached to chassis plate 38 by means
of pivot 40, movement of the bracket 114 in one direc
tion being controlled by cable 81 and spring 81'.
of a roller 57.
A cam 90 (FIGURE 5) termed the outlet cam with
It will be seen that the actuator lever 50 is formed at
which is associated a cam follower lever 91, controls the
one end with an upstanding arm 58 and it is this arm to 60 opening and closing movements of the outlet valve 5
which the roller 57 is secured. The roller, when the
lever 50 is in its upper, normal or “sump empty” posi
tion engages a notch 60 in the detent lever 56. When
the parts are in their normal position (which occurs
during such time as the unit including container C is
being charged with water) the roller 57 rests in the
notch 60 and the lower end of the detent lever 56, which
is provided with a hook portion 61, is urged to the left,
as viewed in FIGURE 4, by a release control spring 62.
The spring 62, which is attached to an anchor pin 39
on lever 50, controls the pressure at which the actuator
lever 50 will disengage from the detent due to the head
of water within the sump S of washing chamber C.
This pressure is so adjusted that it balances the pressure
(FIGURE 1) in the discharge pipe 8.
Assuming that the operator wishes to start up the
machine to perform a washing cycle, the starter knob 68
is rotated to turn the cam shaft 69 anticlockwise, when
viewed in direction of arrow Y, but which is clockwise
when facing in the direction of arrow X. The amount
of rotation required in the embodiment illustrated‘ to
start the motor is approximately an angle of 8° with the
result that the switch cam 110 is turned to disengage
the switch operating plunger 112 projecting from the
switch 111 from a position 112' (see FIGURE 8a), in
which it is in a notch 113 in the cam 110, into which
notch the operating plunger 112 falls when the machine
is stopped. This displacement of the plunger 112 will
close the motor circuit and start up the motor, as the re
Thus the pressure of the washing liquid supply assists in
retaining the inlet valve in closed position.
sult of which drive is transmitted to the impeller and to
the pump although at this time the Washing chamber 4
When the inlet valve is to be opened the plunger 75 is
positively displaced by means of the cam 70 operating
Inlet Valve
through the inlet valve control lever 77, which will produce
a displacement of plunger 75 in direction opposite to that
The inlet valve (see FIGURES 4 and 10) comprises
of arrow N, thus opening up a gap between the plunger
a body part 72 and a cover plate 72'. The body part
and membrane opening 205 to allow water to pass to the
has inner and outer concentric walls 211, 211' providing
opposite side of the membrane. This relieves the pres
a central outlet passage 9 surrounded by an annular
sure acting to retain the membrane 74- against its seating
chamber 73. The chamber 73 is in direct communication
is empty of liquid.
73' as the out?ow area through central opening 205 is
with the water or other washing liquid supply so that
when a valve element conveniently consisting of a mem
greater than the in?ow area through the hole 204. Thus
the diaphragm 74 is forced off its seating 73' by the pres
sure of supply water. Water is then free to ?ow along
passage 9 and through the outlet pipe 3 to the washing
chamber. It will be noted that the area of the annular
gap between the diameters respectively of portion 75” of
the plunger and opening 205 is less than the area of the
bleed hole 204 but the area of the annulus between the
brane 74, which is secured around its periphery by being
clamped between the two parts 72, 72’ of the casing, is
in contact with a seating face 73’ on the central wall 211,
the inlet valve is closed and water is prevented from
passing from the chamber 73 to the central outlet pas
sage 9, leading to the washing chamber.
Membrane 74 has a central opening 205 through which
diameter of plunger portion 206 and hole 205 exceeds that
extends a plunger 75, the plunger 75, which is slidably 20 of bleed hole 204 thus giving a delayed action elfect i.e.
mounted in the casing having a tapered portion 75"
the valve does not open until the plunger 75 is near the
which is seated against the central opening 205 when the
end of its stroke. It follows therefore that movement of
inlet valve is closed to prevent ?ow of liquid from the
the plunger 75 in one direction i.e. when part 75" is with
pressure side to the outlet passage 9.
drawn from the opening 205 allows the diaphragm to
As stated above, the water supply pipe 1 opens into the 25 move from its valve closed to open position. Correspond
interior of the chamber 73.
ingly, movement of the plunger in the opposite direction,
The plunger 75, at one end is formed with an en
larged head 75' which is freely mounted in a recess in
the housing 72’ while its other end extends through an
shown by arrow N, causes the diaphragm to move towards
the valve closed position.
When the valve is fully open and the disc 201 abuts on
opening 3' in the casing Wall, a water tight seal being 30 rib 207 and since the area of slit 208 is less than the area
obtained by a ?exible seal element 200.
On the outer end of plunger 75 is a circumferential
slot 76 (FIGURE 4) for engagement with a pin 76' on
a lever 77 fulcrumed at 78, this lever, which is the inlet
of the annulus between the diameters of the plunger por- .
valve control lever, having a projection 79 (FIGURE
9) for co-operation with the inlet cam 70.
Centrally the plunger 75 has a reduced portion 206
so that when the plunger is depressed by the inlet cam
70 as hereinafter described, the part 206 moves into the
diaphragm opening 205, the annular gap thus provided
enabling the pressure on the reverse side, which assists
in retaining the inlet valve, when closed, on its seating
73’ to escape. When the inlet valve is closed, passage
of liquid from the inlet (via the chamber 73) to the
valve to the outlet passage 9 is prevented partly by the
valve element including diaphragm 204 and its associated
plunger 75 and partly that part 211 of the valve casing
which provided the seating for the valve element.
It is desirable to ensure that the opening and closing
of the‘ inlet valve will require the minimum of force act- '
' ing through the plunger 75 and that the membrane 74
shall remain approximately balanced irrespective of the
pressure of the water supply.
For this purpose reverse face of, the membrane 74 is
recessed to receive an annular metal disc 201 (FIGURE
'10) which prevents the membrane being deformed into
the outlet passage 9 when subjected to substantial water
pressure. The membrane 74 may be corrugated as at 202
to provide su?icient ?exibility and thus to minimize the
force required to move it over its working travel or stroke.
A bleed hole 204 enables the pressure on both sides of
the ?exible portion of the diaphragm to remain balanced
when the valve is closed. Movement of the diaphragm in
the direction to open the valve, which is opposite to the
direction of arrow N, is limited by the disc 201, abutting
against an annular rib 207 in which is a slit 208.
In operation when the inlet valve is closed and the
plunger ‘75 and ?exible diaphragm 74 are in the position
illustrated in FIGURE 10 the diaphragm 74 is retained
tions 75" and hole 205, the pressure in the dished portion
209 of the casing 72', which pressure acts to close the
valve, is small. Also the main diameter of the dished
portion 209 inside rib 207 is larger than the diameter of
the central bore 9, the balance of the pressure on the dia
phragm thus acts to hold it in the fully open position. The
diameter of the bore 9 is greater than the internal diam
eter of the inlet pipe 1 thus minimising the pressure ‘build
up inside the seal 200.
To close the valve, the plunger 75 is moved in the direc
tion of the arrow Z (FIGURE 4) .to block or seal central
opening 205 in the ?exible diaphragm 74, hence the pres
sure acting on the diaphragm which tends to close the inlet
valve, builds up and causes the diaphragm 74 to move to
the closed position abutting against face 73' in unison with
the plunger 75.
A click-over device may be provided in the form of a
spring arm or blade 115 (FIGURE 4) having a V-shaped
end 116 for co-operation with a stop face 117 on the upper
end of the lever 77 by which the plunger 75 is moved to
open to admit water on operation of the inlet cam 70.
It follows, therefore, that on positive action of the lever
77 to open it will ride under the stop 116 and will be held
in the open position by a reverse face 116’ until such time
that the sump is full and there is su?icient mass of water
to displace actuator lever 50 when the latter will drop and
thus exert a pull through a cable 80 so as to restore lever
77 to other side of stop 116.
As has been described a movement of the plunger 75
in the direction of the arrow Z (FIGURE 4) will close the
inlet valve and this movement is brought about by the
cable 80, connected at one end to the plunger 75 and at its
other end adjustably connected through a thumb screw 82
‘ to the threaded opening 67 in the extension 65 on the
actuator lever 50.
Therefore, a few moments after the motor has started,
the rotation of the cam shaft 69 and 'cam 70 will bring the
in valve closed position against the seating 73' by the
inlet water pressure acting through the inlet pipe 1, cham
lobe 71 (see FIGURE 9) into engagement with the pro
jection 79 on the lever 77 which lever by its pin and slot
connection 76 with the plunger 75 will move the plunger
ber 73 and bleed hole 204, on to the outside of the metal '
to open the inlet valve and thus admit water to the cham
ber C.
disc 201 and diaphragm remote from the seating face 73’.
As soon as the required amount of water is present in
It will be seen that the taper portion 7:" of the plunger
75 occupies such a position that it seals the aperture 205. 75 the sump S, the head of water acting through the plunger
46 will overcome the resistance of the spring 62 holding
the detent lever 56 and thus cause the V-notch 60 therein
to disengage from the roller which allows the actuator
lever 50 to drop and rock about its pivot. As a result of
this movement, the actuator lever extension 65 through
the cable connection 8% will pull the plunger 75 in the
stop the motor. If, however, su?icient liquid has not en
tered the sump to cause displacement of the actuator 50,
the plunger 112 will, when it comes opposite notch 113,
protrude su?iciently to enable it to operate the switch 111
to stop the motor until su?icient water has entered the
direction of the arrow N to close the inlet valve and thus
cut off the ?ow of water to the washing chamber.
Referring now to FIGURE 13, there is shown a modi
spring 81’ thereon can be so adjusted as to produce a move
?ed arrangement of the mechanism for closing and open
ing the inlet valve 2.
In this construction the plunger 75 operating the valve
is pivotally connected at 1% to one arm of a spring
biassed two-armed lever 191 having a fulcrum 192 on the
sump S to cause operation of the actuator.
In practice the length of the cable 81 which has a coil
ment of the bracket 114 and thus bodily movement of the
switch 111, which is exactly equal to the depth of the
notches 113, 113’ in the motor switch cam 110.
The additional notches or depressions 113' are pro
vided in the switch cam 110‘ to switch the motor 011 during
Washing and rinsing operation, unless the correct amount
casing, the other arm of the lever being connected through 15 of water has entered.
a wire cable 193 to the lever 77 under the control of the
Water Heat Control Mechanism
inlet cam 70. A spring 199 is connected to the lever 191
at its lower end so that the lever will normally assume a
Control of the water heating resistance element 30 is
position where plunger 75 is withdrawn and the inlet valve
by means of a cam 130 (see FIGURE 7) and an asso
is closed.
ciated lever 131 having a fulcrum 132 and one end of
When the two-armed lever 191 has been actuated by
which lever is provided with an adjustable stop 133 for
the cam 70 to open the inlet valve to admit water to the
engagement with a projection 134 on the underside of
chamber, its lower end 197 is moved sui?ciently to the
the actuator lever 50', the other end of the lever 131 hav
right (counterclockwise) where a spring biassed latch 194
ing an upturned end 135 for engagement with cam 130.
ivotally attached at 195 to an extension 196 of casing 72 25 An arm 131’ (see FIGURE 5) projects perpendicularly
will move into engagement therewith in which position it
from lever 131 and is adapted to contact heater switch
is held to retain the valve open. This state of affairs will
continue until such time as the actuator lever 50 is re
turned to its closed position when a cable 198 attached to
the latch 194 will disengage it from the lever 191. On
release of the lever 191 it will be restored to the inlet
valve closed position by means of the spring 199.
139 and switch this on by means of an adjustable set
screw 131" when the actuator lever 50 is moved down
It will be appreciated that since the actuator lever 50
does not move to close the inlet valve until su?icient
water has entered the washing chamber, it is impossible
for the heating circuit switch to be closed and the heater
switched on until there is su?icient water in the washing
It will be seen that the actuator lever 50 is also cou- '= chamber.
pled by means of a cable 81 to the bracket plate 114 (see
Thus the correct amount of water in the washing unit
FIGURE 8) on ‘which the motor switch 111 is carried and
through the depression of the actuator lever 50 will cause
Which bracket 114 is capable of pivotal movement about its
three things to happen.
fulcrum 40' on the chassis plate 38. On displacement of
(1) Water inlet valve 2 shuts.
the actuator lever 50, since it is connected to the bracket
(2) Motor switch 111 is displaced bodily to a position
plate through the cable 81, it will cause bracket plate 114
where it will remain on irrespective of the relative posi
Motor Control Switch Mechanism
carrying the electric switch 111 to move in a counterclock
tions of switch plunger 112 and cam 110 so that the motor
is kept running.
wise direction about its fulcrum 40 causing further move
ment (depression) of the switch plunger 112, which will
(3) The water heater is switched on.
be moved from the dotted line position 112" (FIGURE 45
It will be appreciated that so long as the motor switch
8A) to position 112'”.
remains closed the motor will revolve and in addition to
As previously described, the washing machine is started
causing circulation of the Water and rotation of the im
up by turning the control knob 68 in a counterclockwise
peller, the cam shaft 69‘ will continue to revolve.
direction which turns the cam 110, as shown in FIGURE
By suitable positioning of three lobes 136, 137 and 138
8, in the direction of the arrow. This brings the motor
on the cam 130, it is possible to effect the return move
ment and thus control the actuator lever 50 since on en
gagement of lobe 136, 137 or 138 with end 135 of lever
131, the latter will be moved to restore the actuator 50
switch plunger which, when the machine is switched oif,
lies in notch 113, opposite one of ‘the parts of the perime
ter of the cam Where its radius is a maximum and as a re
sult the plunger is depressed and moves from the (motor
stop) full line position 112 (FIGURE 8A) to position
No. 1 indicated in dotted lines at 112". This depression
of the plunger starts the motor. When the motor starts,
to its initial position. It follows that when the desired
amount of time has elapsed to secure correct washing (as
determined by the speed of rotation of the cam and gear
drive thereto, and provided the sump is empty and all the
Water drained therefrom as hereinafter described) the lobe
the cam 110 begins to revolve in the direction of the ar
row (FIGURE 8) and so long as the plunger remains
137 on the cam 130‘ will engage the end 135‘ of the lever
opposite the part of the perimeter of the cam of maximum 60 131 so as to return the actuator lever 50 to» its normal or
radius the motor remains switched on. If, before the
“no water” position, where the roller 57 thereon will re
enter the notch 60 in the detent lever 56. Simultaneously
plunger comes opposite the notch 113, there is a move
ment of the switch plate 114 such as is produced through
the movement of the lever 131 will move the switch in the
the cable 81 when the actuator 50 is displaced on the
water heater circuit to its open position thus cutting off
Washing chamber containing the requisite head of liquid, it 65 the heating current.
follows that there will be a further depression of the
Draining Operation
plunger. This additional movement, which is equal to
the depth of the notch 113, moves the plunger to the No. 2
The third cam 90 (FIGURES 6 and 7) which is the out
position shown in dotted lines at 112'”. Since the ex
let (discharge) control cam controls the openingand clos
tent of this movement is equal to the depth of notch 113, 70 ing of the drain valve 5. Outlet cam 90 co-operates with
it follows that when, after further rotation of the cam,
a lever 91 which is pivotally mounted on a fulcrum 152
the plunger 1112 again enters the notch 113 or one of the
on a bracket plate 153 fast on chassis 38. At its lower
other depressions 113’ of the cam, its return movement
end the lever 91 is connected by a cable 154 passing
to position 112", although in the direction for opening
through a hole in a guide bracket 155 and connected to
switch 111, will not be far enough to open the switch and 75 the pivoted member 150 carrying a rubber stopper or
plug 151 by which the drain is normally closed (see FIG
which the inlet valve opening and closing mechanism,
the motor switch control mechanism and heater switch
are actuated. The extension 272' within the chamber
273 projects below the air pocket 273' and into the wash
It will be seen that the cam 90 has an operative por CR ing liquid at the bottom of the chamber 273, thus main
taining within the chamber 273 a division between the
tion 156 which corresponds to the valve closed position,
washing liquid and the air extending as a ?uid column
the remaining portion of the cam being of reduced radius
from the air pocket 273' through the conduit 277 and into
as shown at 157 and which corresponds to discharge or
‘URE l), the member 150 being spring biased to a posi
tion to open the discharge valve and being maintained
closed by the cable 154.
' drain valve open position.
the chamber provided by the bag 279.
The valve automatically
‘moves to its open position under the action of a spring. 10 washing liquid is prevented from entering the bag cham
ber 27 9.
In the operative portion 156 of the perimeter of the
In the construction shown in FIGURE 12 the cover
cam 90 is a notch 156a which provides a “click in” loca
plate 278’ of pressure chamber 278 is of dished :forma
tion so that the bag 279 will conveniently conform to
ing position when turning the knob 68 to rotate the cam
‘shaft 69 prior to closing electric switch 111 to start the 15 the ‘shape of the chamber and thus provide a central de
pression to receive the V-shaped end 281 of the actuator
motor. On rotation of the cam 90 from the position shown
lever 23%, this lever having a loop 282 and being pivotally
in FIGURE 7 when the cam arrives at the shoulder 158
mounted by this loop on a bracket 283 attached to the
leading into the dwell portion 157 of reduced radius or at
of the casing 278.
_ shoulders 158', 158", a projection 159 on the lever 91 will
Any rise of water in the sump S will tend to produce
be allowed to move inwardly and thus permit movement
expansion of the bag 2719, and in order to control the
of the cable 154 to enable the drain valve to open under
level of water within the sump S there is provided a form
the action of its spring.
of latch or retaining means by which movement of the
This state of affairs continues until such time as the
bag 279 due to the rise in pressure does not become effec
projection 159 encounters the rising portion 160 or 160'
tive to cause displacement of the lever 281, until the
or 160" when the discharge valve will be moved to its
has reached the desired level.
closed position.
As an alternative to a mechanically operating latch
It will be appreciated that a complete revolution of the
device, i.e. the detent lever 56 of FIGURE 4, the latch
cams corresponds to a cycle of washing, rinsing and dry
operates magnetically. For this purpose there is pro
ing operations.
30 vided a permanent magnet 284 and an armature 285 for
co-operation ‘therewith. The armature 285 may be at
Dispenser Additive Control Mechanism
tached to an extension 286 of the actuator lever 280 and
An auxiliary cam 170 (see FIGURE 9) may be pro
is so arranged that when the sump is empty and the actu
vided on the shaft 69 for co-operation with a lever 171
ator lever 280 is in normal posit-ion with the bag 279
connected by means of a cable 172 to the two-armed
de?ated (prior to opening of the inlet valve to admit water
lever 36 by which, in the embodiment illustrated in FIG.
the washing chamber), the armature 285 is in a position
1, the plunger 34 of the dispenser nozzle can be de
' tion ‘and serves to enable the operator to locate the start
adjacent the magnetic element 284.
It will be appreciated, therefore, that when the pres
pressed to cause an additive, e.g. a detergent to be in
jected into the washing or rinsing water.
sure within the bag 27 9 is suf?cient to overcome the pull
Remote Operation Control Mechanism
4.0 exerted by the magnet 284 the varmature 285 will be
forced upwardly and away from the magnet 284 causing
For convenience of adjustment and maintenance, pro
the lever 280 to pivot about its fulcrum 282 and to set
into operation, the chain of operations described in con
vision may be made to remove the actuator lever 50
from a position immediately beneath the sump to one
adjacent the cam mechanism.
‘In the arrangement shown in FIGURES l1 and 12 the
opening 43 in the bottom of the sump S comprises a neck
nection with FIGURES 4 to 9.
the washing unit is ‘charged with Water and dispensed ad
ditive which is maintained at a required temperature by
electric immersion heater, these operations being con
portion 270 connected by short length of hose 271 to a
connecting ?ange 272 of a separate sump pressure cham
her 273.
trolled by a series of cams including the motor start and
stop switch cam, inlet valve cam, the dispenser valve cam
and the drain valve cam, these cams and their associated
mechanisms performing the same functions as those here
inbefore described.
The cam shaft, which is driven through a reduction
gear from the electric motor E, is indicated at 69' and
has four control cams, parts only of which can be seen
in FIGURE 15.
The pressure chamber 273 conveniently is circular and ‘
is formed with a well 274 with a lateral outlet 275 lead
ing to the manifold as described in connection with 'FIG
URES 1 and 4.
‘In the upper wall of the chamber 273 is a spigot con—
nection 276 to which is connected one end ‘of a length
of tubing 277 its other end leading to a second chamber
278 (FIGURE 12) housing a bag 279 of rubber or other
'?exi-ble material. It will be seen that the chamber 278
has a separate cover plate 278' which rests on the
bag 279.
Referring to FIGURES 15 and 16 there is shown a
modified version of the valve control mechanism in which
Itwill be seen that the ?ange 272 of the chamber 273
has an extension 272’ which extends below the level of
the outlet pipe 276 thus creating an air pocket 273' above
the water level in the chamber 273. A ?lter F is posi
tioned above the opening 43. When the sump S is full,
there will be a rise in pressure in the interior of the
pressure chamber 273 due to the head of water, as a
result of which the entrapped ?uid, e.g. air 273’ in the
chamber will be subject to a corresponding rise in pres
sure. This pressure rise is transmitted by the conduit
or pipe connection 277 to the extendable bag 279, the
movement of the bag 279 or other pressure responsive
element being utilized to bring about ‘movement of an
actuator lever device 280 corresponding to the actuator
lever 50 shown in FIGURES 4 to 9 and by means of 75
Control of the motor switch, indicated generally at
111’ is by a circular cam element having in its perimeter
a series of notches 1130 similar to the switch cam 110
shown in FIGURE 8 and by an associated lever 408.
Control of the inlet valve 2 (see FIGURES 4, 5, 9
10) is by a rotary cam similar to earn 70' and hav
three lobes similar to the lobe 711 on the cam 70
cooperation with a two-armed lever 411 mounted
rocking movement on a fulcrum 413, these move
ments being transmitted to the inlet valve by a Bowden
wire type cable 80'.
Control of the dispenser valve 326, by which liquid
is dispensed from the container 301 (see FIGURE 14),
is by a two-armed lever 414, this lever 414 being en
gaged by two lobes 1131 on a third circular cam tast
ened on cam shaft 69' and being mounted on the same
fulcrum 413 as that of the lever 411.
vFinally the drain valve 5 (FIGURE 1), which nor
mally remains closed, is actuated to open by a Bowden
of which it is held in the open position. On the other
arm of the latch lever 430 is a roller 435 which is posi
Wire 154' connected to a cam lever 91’ also mounted on
tioned adjacent to the tail 404 of the actuator lever 402
the common fulcrum 413, this lever 91’ engaging
for engagement thereby as hereinafter described. It will
shoulders 1158 in a fourth cam similar to the cam 90 5 be understood that when a sn?icient quantity of water is
(FIGURES 6-7).
present in the washing chamber, the pressure in the sump
As previously described in connection with FIGURES
thereof, which is transmitted through the air trap to the
11-12, for purpose of easy control and adjustment the
bellows 400, will operate to cause a movement of the
actuator 402 ‘(FIGURE 15) is operated by a chamber
diaphragm 279' upwardly, thus producing a counterclock
or bellows device similar to that shown in FIGURE 12 10 wise motion of the actuator lever about the pivot 403.
and connected to the sump air trap by a pipe line cor
On one end of the actuator lever is a permanent magnet
responding to pipe line 277 (see also FIG. 11).
440 shrouded by a sleeve 441. The permanent magnet
The bellows or pressure chamber device 400 comprises
when the actuator lever is in the non-operative position
a rubber or like ?exible diaphragm 279' provided with a
is in engagement with an armature 442 provided with a
thin aluminium cover plate 278’, against the upper side
trip arm, 443 extending beneath the bellows device. At
of which plate 278', an actuator lever device 402 bears,
tached to the armature 442 through a hook 445 is a ten
the lever 402 being pivoted to the washing machine cas
sion spring 444 the other end of which spring is connected
ing at ‘403 and being formed with a projecting tail 404
to one arm 446 of a two armed stop lever 447, the posi—
and an offset downwardly extending arm 405, to which
tion of the stop lever being adjustable by means of a screw
arm 405 a connecting rod 406 is pivotally attached. An
448 to vary the tension of the spring 444 resisting the
adjustable nut on the other end of the connecting rod
upward thrust of the bellows plate 278', and thus to vary
abuts against a ball shaped head 407 on a motor switch
the amount of water present in the Washing chamber be
operating elbow shaped lever 408 which is pivotally
fore the actuator lever commences to move.
When the
anchored at its other end 409 to the casing and is formed
actuator lever 402 moves upwardly due to movement of
between its ends with a projection 410 for engagement 25 the bellows 400 the magnet 440 at the end of the actuator
with the motor switch cam.
lever will lift together with the magnet armature 442
The motor switch 111' which is mounted on a bracket
which will move upwardly against the bias of the tension
also pivoted at 409 is operated by a push button 112’ in
spring 444 until the trip lever 443 strikes the bottom of
engagement with the elbow of the lever 408.
the bellows casing when the armature will be arrested
The dispenser valve is indicated at 416 and is placed .1 and tilted to release the magnet, whereupon the actuator
in a pipe line 417 leading from the dispenser container
lever is free to move to its fully open position. The mag
to the washing chamber manifold or to an air bottle
net armature now returns to its normal position by the
whereby pressure on the water being fed to the washing
tension spring 444 until it abuts against a seating 447
chamber is transmitted to the valve.
formed on the casing. It will be appreciated that the
Referring now to FIGURE 18, the dispenser valve com
control of the actuator lever by means of the magnet and
prises a rubber sleeve element 418 having circumferential
variable tension spring provides of easy adjustment, since
ribs 419 to encircle the pipe line 417 so as to provide an
the tilting of the armature away from the magnet requires
relatively little force, and the biassing force is not appre
ciably altered by variation of the strength of the magnetic
?eld between the magnet and its armature.
interior annular chamber which is provided with a circum
ferential rib 420, the arrangement being such that the
entire sleeve element is displaceable axially of the pipe 417
by means of the dispenser valve control lever 414.
As can be seen from FIGURE 15, the bifurcated end
415 of a lever 414 rests in engagement with the upper one
of two discs 422, 423, mounted at each end of the valve
sleeve 418, the lower disc 423 being supported by a helical
return spring 427 which in turn is seated against a bracket
426 on the casing wall. Direct passage of air through the
interior of pipe line 417 is prevented by a partition wall
424, dividing the pipe into two blind chambers in each
of which are ports 425, 425a and between which in the
normal position of the parts, a direct flow of air along the
pipe line is prevented. The ports are so positioned that
one port or set of ports 425a is open to the atmosphere
to ensure the pressure in the pipe line leading to the dis
penser container remains at atmospheric pressure.
On rotation of the dispenser valve cam, the lever 414 is
displaced by contact of the cam lobes 1131 therewith to
an amount su?icient to produce axial movement of the
sleeve element downwardly as viewed in FIGURES l5
and 18 so as to cause the two sets of ports 425, 425:: to
On counterclockwise movement of the actuator lever
the tail 404 thereof strikes the roller 435 at the end of
the two armed latch lever 430 and moves this lever to
release the inlet valve cam lever ‘411, allowing this to
return to its valve closed position.
At the same time the arm 405 of the actuator lever 402
moves in a counterclockwise direction, causing the motor
switch lever 408 to disengage from the motor switch cam
by means of the connecting rod 406. This has the eifect
of depressing the switch push button 12 still further and
preventing the motor switch from being switched 011,
which operation would have happened, due to the engage~
ment of the projection 410 in a notch in the motor switch
cam, had there not been sufficient water in the washing
chamber to bring about actuation of the actuator lever in
the manner ?rst described.
In operation, the nut on rod 406 is so adjusted that it
abuts against the end 407 of the lever 408 when the
projection or lobe 410 is in the motor stopped position in
one of the notches 1130 in the motor switch control cam,
be placed in direct communication with one another 60 and the actuator 402 is in its inoperative position. It fol
through that part of the annular chamber above the rib
lows that when the cam is rotated to start the motor the
lobe 410 rides out of the notch onto a part of the cam
It follows that the pressure air is transmitted from the
perimeter of maximum radius so that the switch plunger
manifold air trap direct to the dispenser to cause operation
112' is depressed to close the switch 111', and also with
of the latter to discharge the required additive compound.
the result that the end 407 of lever 408 moves out of
In operation on intial movement of the cam shaft 69'
when the machine is started by turning the knob 68
(‘FIGURE 5) the inlet valve cam lever 411 is moved in
a counterclockwise direction as seen in FIGURE 15 to
open the inlet valve and is then held in this position by
one arm 432 of a spring biassed latch lever 430 which is
pivoted at 431 to the casing. On the arm 432 is a shoul
der 433 which is positioned to engage with an extension
434 at the upper end of the inlet valve lever and by means
contact with the end of rod 406. Should a notch 1130
come opposite the lobe 410 before the actuator operates,
the lobe will move into the notch and the motor will be
switched o?, and the end 407 of lever 408 will once again
enter into contact with the end of rod 406.
When the actuator 402 operates, the rod 406 will push
lever 408 out of contact with the cam and will at the same
time cause lever 408 to switch the motor on again. Simi
larly, if the actuator has operated before the rotation of
the cam brings one of the notches 1130 opposite the lobe
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